Sir Paul, Elton, other stars to perform for queen (AP)

British singer Elton John performs in concert at the Ricardo Saprissa stadium in San Jose, Costa Rica, Friday Feb. 3, 2012. This is the first time Elton John performs in Costa Rica. (AP Photo/Ronald Reyes)AP – Some of the world’s biggest pop stars will perform in front of Buckingham Palace on June 4 to celebrate Queen Elizabeth II’s Diamond Jubilee, palace officials said Tuesday.